![view A man controlling the titration of bacteria in a vaccine with the aid of an optical apparatus. Photograph, [ca. 1940].](https://iiif.wellcomecollection.org/image/V0019006/full/300,/0/default.jpg)
In copyright
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Credit
A man controlling the titration of bacteria in a vaccine with the aid of an optical apparatus. Photograph, [ca. 1940]. Wellcome Collection. In copyright. Source: Wellcome Collection.